1984] 
Wise — Phenology of filmy dome spider 
279 
□ IMMATURE SPIDERS 
HI ADULTS 
■ ALL ADULTS (STAGES 
6 & 7 COMBINED) 
ISOLATED AT 
STAGE I 
ISOLATED AT 
STAGE 2 
ISOLATED AT 
STAGE 3 
(n — 4 I ) 
(n = 32) 
(n = I 6) 
Figure 5. Development of immature spiders collected from the Liberty popula- 
tion on 6 July 1981 and reared in the laboratory. All had either matured or died by 
the end of August. 
rate of development was not perfect. A few of the more advanced 
juveniles stage 3) survived but failed to mature during the 1982 
season (Table 4). 
Discussion 
Maryland populations of the filmy dome spider exhibit a poly- 
morphic life history pattern similar to that discovered in a more 
northern population in Michigan (Wise 1976). The phenology of the 
Liberty population more closely resembled that in Michigan than 
did the pattern at Patuxent, though data suggest considerable year- 
to-year variation at the latter site. This research has also furnished 
